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    (x^2-√2x+1/3)^2
    x²+√2x=12
    2x²+2√2x=9
    (131+307.5)/30*x+240/30*(x+15)+120/30*(x+30)=1828
    2x²+2√2x=9
    (x-2)(x+3)=0
    (x+2)(x-3)=0
    (x-2)(x-3)=0
    (x-75)^2+(x+75)^2-2*(x-75)(x+75)cos20=160*160
    b-2b
    16x²-84x+101=0
    X-15/4=3
    x²-100x-250=0
    x²+9/2x=4
    x²+9/2x=4
    (169+389)/30*x+193/30*(x+15)+90/30*(x+30)=1145
    49x×x-200x+150=0
    49x-200x+150=0
    -2x^2-12x-13=0
    6t²+5t=125

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